[R] blank upper or lower triangle of cor-matrix

[Christos Hatzis]

And if you want to know how it is done, take a look at 

stats:::print.dist

-Christos 

> -----Original Message-----
> From: Christos Hatzis [mailto:christos at nuverabio.com] 
> Sent: Wednesday, February 07, 2007 2:16 PM
> To: 'Leo Gürtler'; 'r-help at stat.math.ethz.ch'
> Subject: RE: [R] blank upper or lower triangle of cor-matrix
> 
> You can try
> 
> as.dist(d)
> 
> 
> Christos Hatzis, Ph.D.
> Nuvera Biosciences, Inc.
> 400 West Cummings Park
> Suite 5350
> Woburn, MA 01801
> Tel: 781-938-3830
> www.nuverabio.com
>  
>  
> 
> > -----Original Message-----
> > From: r-help-bounces at stat.math.ethz.ch 
> > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Leo Gürtler
> > Sent: Wednesday, February 07, 2007 1:36 PM
> > To: r-help at stat.math.ethz.ch
> > Subject: [R] blank upper or lower triangle of cor-matrix
> > 
> > Dear altogether,
> > 
> > I want to blank the lower (or upper) part of a correlation 
> matrix as 
> > it is done by dist()
> > 
> > example:
> > 
> > ( d <- cor(matrix(runif(12),nrow=4)) )
> > 
> > If I do the following
> > 
> > d[lower.tri(d)] <- ""
> > 
> > of course everything is changed to character - that's not 
> what should 
> > be.
> > Additionally, it does not work to assign "0" or anything else. The 
> > same is true for assigning "NA".
> > 
> > However, what I want is like the following:
> > 
> > ( dist(matrix(runif(12),nrow=4)) )
> > 
> > Looking into dist(), it seems that the calculation and the 
> matrix are 
> > done in C and not in plain R.
> > 
> > How can I realize it?
> > 
> > thanks!
> > 
> > best,
> > 
> > leo
> > 
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> > 
> >